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subarus are all wheel drive.
the front axles always turn, the rear axles always turn, the middle driveline always turns, the transmission always turns.
The manual and automatic trans are slightly different in the central differential. On the automatics, the front axles are hard connected to the trans output, and the rear diff is connected via computer controlled coupling. This means the fronts always turn, and the rear propels the car when the computer tells the central diff to help out.
On the manual, there is a spider gear setup to where power goes to "both" front and rear differentials.
On the auto's you can pull the fuse which disables the computer controlled coupling.
Adding it all up, and I really doubt there is fuel savings in worrying about any of this.
The subies are HEAVY vehicles. They don't get great mileage.
On restart, when you hit the key the computer gives an "extra" shot of gas to smoothly start the engine. I don't know what you do to override this.
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